Easy Installation: Well-made with heavy-duty brackets and 2 strong screws for stability. The aquarium fan can be firmly mounted on the fish tank. Perfect for freshwater and saltwater tanks with a glass thickness less than 0.6 inches (for lipless aquariums) Powerful Wind: With 7 robust blades, the quiet aquarium fan provides strong wind continuously. Effectively accelerate heat dissipation and reduce tank temperature by 2 C to 4 C. Great for keeping your aquatic pets cool and comfortable all year round Controllable Wind Speed: 5 levels of wind speed available! The fish tank cooling fan can be flexibly adjusted for the most suitable wind speed. Always prepare the most pleasant wind for distinct aquatic life in different seasons Timing Function: With a convenient timer on the controller, the aquarium chiller is expected to work for 0.5 h, 1 h, 2 h, 4 h or 12 h. Manually customize the working hours as you like based on wind speeds and aquarium temperature